Details about data processing

[guilunmeibeautiful]

Great work, thanks for sharing the code. I am a novice in the field of trajectory prediction. I read the code and encountered some problems that I don't understand. Please help me answer them.

1. What is "Make coordinates relative"?
2. Why is there a distinction between "Linear vs Non-Linear Trajectory"?
3. What is the function of the poly_fit method in utils.py?
   Thank you very much!

[guilunmeibeautiful]

Also, how to train and test the code under windows?

[abduallahmohamed]

Thanks for asking.
This data loader is taken from Social-GAN.
1- Relative to the first position, they are also delta between position aka speed
2- This is a very old topic, but lines trajectories are easier to predict using classical methods and models like constant velocity models. On the other hand, non-linear ones have patterns that are hard to model like sudden change in trajectory or sudden stop.
3- It just fits a polynomial to the trajectory, very old approach to benchmark against showing the benefit of data driven models.
I encourage to take a look into our latest work "Social-Implicit".

[abduallahmohamed]

I'm not sure about windows as I never used it before for development.